in soviet Russia, giraffe rockets you? no.... rocket you giraffes? hm.... rockets giraffe the Russians? Darn! stupid jokes are harder to make than they look XD!
In other words, the game is grate as it is. I hate it when I see 4 out of the 5 top comments are suggestions, and that that highest one basically cover what every other comment says...
if you make a portal above a block of stone (that you cant portal through) you will jump towards it, and jump through the stone. I'm pretty sure this isn't supposed to happen. :P.
next game you make, you might want to program the zombies to somehow be able to tell when they are running into a wall. Most of the time at the end of a round there are massive groups just running into the sides of wall forever not going anywhere.
this is simple a test people..... Would YOU want to put a ton of work into something, just to have it ruined by ONE feature? ehaugw is the one that made it, and he himself explained that Kong can remove it.